1Blurb::
2Gradients are needed and will be obtained from a mix of numerical and
3analytic sources
4
5Description::
6The \c mixed_gradients specification means that some gradient
7information is available directly from the simulation (analytic)
8whereas the rest will have to be finite differenced (numerical). This
9specification allows the user to make use of as much analytic gradient
10information as is available and then finite difference for the
11rest.
12
13The \c method_source, \c interval_type,
14and \c fd_gradient_step_size specifications
15pertain to those functions listed
16by the \c id_numerical_gradients list.
17
18Topics::
19Examples::
20For example, the objective function may be a simple analytic
21function of the design variables (e.g., weight) whereas the
22constraints are nonlinear implicit functions of complex analyses
23(e.g., maximum stress).
24
25Theory::
26Faq::
27See_Also::	responses-numerical_gradients, responses-no_gradients, responses-analytic_gradients
28